code: def __str__(self):
      return self.name
  
file_path: hail/batch/batch/cloud/gcp/worker/disk.py
imports: import logging
  import os
  from typing import Dict, Optional
  from hailtop.aiocloud import aiogoogle
  from hailtop.utils import CalledProcessError, LoggingTimer, check_shell_output, retry_all_errors_n_times
  from ....worker.disk import CloudDisk
label_desc: Use image node_id 3 for calling the GCPDisk obj's underlying member method code with example usage: obj.__str__() and returns: self